I love the GM medium duty trucks. But I believe parts are harder too find now. I know of 1 car hauler that couldn't find injectors for the big 7.8/

The cat powered one would be my choice.

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I have two local Chevy dealers that are both GM certified medium duty service centers. They said they have no trouble getting parts from GM for these trucks. I called them because I had the same fear as you.Posted via Mobile Device

I wouldn't go with a crew cab in a medium duty truck. For hauling the crew around a crew cab pickup would be better. The medium duty would be used for hauling materials and equipment. I'd vote the cat diesel for an engine.